ASILIN^ 



633 



Legs not mainly yellowish, witli not even the tibiae mainly clear 



reddish or orange. Abdomen not shining black dorsally or yentrally. 



A large genus of which some males are not easily distinguished 



from Eutolmus. . ,, 



7. Machimus. 



39 (38) Eighth ventral segment of the male not produced or widened. 



40 (41) Legs mainly shining yellow or orange, and with the ground colour 



not obscured by dust. 



Only two very distinct supra-alar bristles. About twenty species 

 known from South or Central Europe, but none from North Europe. 



N.B.— If the tibia} only are conspicuously bright orange compare 

 Neoitamus and Paritamus. 



Heligmoneuea. 



41 (40) Legs mainly black, or if yellow the ground colour always (except 



the tibice of Neoitamus and Paritamus) obscured by dust and 

 consequently appearing dull. 



42 (43) Abdomen shining black both dorsally and ventrally. 



Face-knob large. A very distinct-looking species. 



Stilpnogastek. 



43 (42) Abdomen grey on both or at least one surface, and in no case 



shining black. 



44 (45) Yellowish grey or ashy grey flies. Legs striped or ringed with 



dull orange and of a peculiar brownish grey appearance 

 (in one species nearly all blackish grey). 

 Never large species. 



9. Epitriptus. 



45 (44) Blackish grey flies. Legs black, but 



sometimes with the tibiae more or 

 less orange. 



46 (47) Dark thoracic stripes bare. Ovipositor 



very long and apparently including 

 the sixth and seventh abdominal 

 segments. 



Male with the sixth and seventh 

 abdominal segments shining. Tibiae con- 

 spicuously bright orange. 



8. Neoitamus. 



47 (46) Dark thoracic stripes more or less 



clothed with minute bristles. Ovi- 

 positor not including the sixth and fio. soi. 

 seventh abdominal segments. 



48 (49) Male genitalia conspicuously swollen. Tibite conspicuously 



bright orange. 



Paritamus. 



49 (48) Male genitalia not conspicuously swollen. Tibi£e black, or when 



pale colored not bright orange from the base to almost the tip. 



-Oinmatius chinensis 

 <J. X 24. 



